Antenna device

Abstract

Provided is an antenna device with a simple configuration, said antenna device supporting a plurality of frequency bands. An antenna device according to the present invention is provided with: at least one first radiation element that has a resonant frequency in a first frequency band; at least one second radiation element; and a connection line for connecting the first radiation element and the second radiation element. The line length formed of the first radiation element, the connection line, and the second radiation element is set to a length so as to have a resonant frequency in a second frequency band lower than the first frequency band.

The invention claimed is: 
     
       1. An antenna apparatus, comprising:
 at least one first radiation element having a resonance frequency in a first frequency band; 
 at least one second radiation element; 
 a connection line connecting between the first radiation element and the second radiation element, 
 wherein a line length formed by the first radiation element, the connection line, and the second radiation element is set to a length so as to have a resonance frequency in a second frequency band lower than the first frequency band. 
 
     
     
       2. The antenna apparatus according to  claim 1 , comprising a plurality of the first radiation elements, wherein:
 the connection line connects between respective center portions of the plurality of first radiation elements. 
 
     
     
       3. The antenna apparatus according to  claim 2 , wherein:
 power supply in which at least one of a phase value and a power value is controlled is performed to the plurality of first radiation elements. 
 
     
     
       4. The antenna apparatus according to  claim 2 , wherein:
 the plurality of first radiation elements are disposed in a polarization direction and in a direction vertical to the polarization direction, and 
 the second radiation element includes a part extending along the polarization direction, and a part extending along the direction vertical to the polarization direction. 
 
     
     
       5. The antenna apparatus according to  claim 1 , comprising:
 a third radiation element having a resonance frequency in a third frequency band lower than the second frequency band; 
 a ground pattern connected to the second radiation element and coupled with the third radiation element in an electromagnetic field coupling manner; and 
 a power supplier provided in the third radiation element, supplying power of the second frequency band to the second radiation element, and supplying power of the third frequency band to the third radiation element. 
 
     
     
       6. The antenna apparatus according to  claim 1 , wherein:
 an insulation layer is provided between the first radiation element and a conductor provided at a position facing the first radiation element. 
 
     
     
       7. The antenna apparatus according to  claim 1 , wherein:
 a conductor provided at a position facing the first radiation element has a larger size than the first radiation element. 
 
     
     
       8. An apparatus, comprising:
 circuitry, which in operation, controls:
 at least one first radiation element having a resonance frequency in a first frequency band; and 
 at least one second radiation element, wherein the first radiation element and the second radiation element are connected by a connection line; and 
 
 a transmitter, which in operation, radiates radio waves generated by the circuitry, 
 wherein a line length formed by the first radiation element, the connection line, and the second radiation element is set to a length so as to have a resonance frequency in a second frequency band lower than the first frequency band. 
 
     
     
       9. The apparatus according to  claim 8 , comprising a plurality of the first radiation elements, wherein:
 the connection line connects between respective center portions of the plurality of first radiation elements. 
 
     
     
       10. The apparatus according to  claim 9 , wherein:
 power supply in which at least one of a phase value and a power value is controlled is performed to the plurality of first radiation elements. 
 
     
     
       11. The apparatus according to  claim 9 , wherein:
 the plurality of first radiation elements are disposed in a polarization direction and in a direction vertical to the polarization direction, and 
 the second radiation element includes a part extending along the polarization direction, and a part extending along the direction vertical to the polarization direction. 
 
     
     
       12. The apparatus according to  claim 8 , comprising:
 a third radiation element having a resonance frequency in a third frequency band lower than the second frequency band; 
 a ground pattern connected to the second radiation element and coupled with the third radiation element in an electromagnetic field coupling manner; and 
 a power supplier provided in the third radiation element, supplying power of the second frequency band to the second radiation element, and supplying power of the third frequency band to the third radiation element. 
 
     
     
       13. The apparatus according to  claim 8 , wherein:
 an insulation layer is provided between the first radiation element and a conductor provided at a position facing the first radiation element. 
 
     
     
       14. The apparatus according to  claim 8 , wherein:
 a conductor provided at a position facing the first radiation element has a larger size than the first radiation element. 
 
     
     
       15. A method, comprising:
 controlling
 at least one first radiation element having a resonance frequency in a first frequency band; and 
 at least one second radiation element, wherein the first radiation element and the second radiation element are connected by a connection line; 
 
 radiating radio waves generated by the at least one first radiation element and the at least one second radiation element, 
 wherein a line length formed by the first radiation element, the connection line, and the second radiation element is set to a length so as to have a resonance frequency in a second frequency band lower than the first frequency band.